feat(robomp): added local issue indexing and commit-search tool support

- Added `ROBOMP_ISSUE_INDEX_SYNC_SECONDS` configuration and lifecycle-managed issue indexing through startup/shutdown hooks.
- Added issue/PR index tables with FTS5 triggers plus upsert and keyword/filter search helpers for indexed records.
- Added GitHub backend/proxy support for `IssueIndexEntry` and issue-index page retrieval, including webhook ingestion and periodic watermark-driven sync.
- Updated `gh_search_issues` to prefer local index queries when synchronized and added `search_commits` host tool with query modes and validation.

python/robomp/tests/test_server.py

@@ -958,6 +958,42 @@ def test_webhook_incoming_pr_comment_without_directive_skips_without_counting_bu
     assert states == ["queued", "queued", "skipped"]
 
 
+def test_webhook_delivery_populates_issue_index(settings: Settings) -> None:
+    """Every issue-carrying delivery upserts the local search index — including
+    ones the router skips (here: a conversation comment on an incoming PR)."""
+    app = create_app(settings)
+    with TestClient(app) as client:
+        payload = {
+            "action": "opened",
+            "issue": {
+                "number": 501,
+                "title": "grep misses colon filenames",
+                "body": "read tool peels the selector suffix",
+                "state": "open",
+                "user": {"login": "alice"},
+                "author_association": "NONE",
+            },
+            "repository": {"full_name": "octo/widget"},
+        }
+        body = json.dumps(payload).encode()
+        resp = client.post(
+            "/webhook/github",
+            content=body,
+            headers=_signed_headers("test-webhook-secret", body, event="issues", delivery="idx-1"),
+        )
+        assert resp.status_code == 202
+
+        skipped = _post_pr_issue_comment(client, delivery="idx-2", user="stranger", pr_number=502)
+        assert skipped.json()["state"] == "skipped"
+
+        db = get_database(settings.sqlite_path)
+        by_body = db.search_issue_index("octo/widget", keywords=("selector", "suffix"))
+        pr_row = db.search_issue_index("octo/widget", is_pr=True)
+    close_database()
+    assert [e.number for e in by_body] == [501]
+    assert [e.number for e in pr_row] == [502]
+
+
 def test_webhook_contributor_gets_higher_cap(rate_limited_settings: Settings) -> None:
     app = create_app(rate_limited_settings)
     with TestClient(app) as client: